350 people were detained 36 hours after the incident in Maharashtra — police claim that these are people rounded up for investigations. On 14 July, Lashkar-e-Qahhar, a terrorist organisation Front linked to Lashkar-e-Taiba (LeT), claimed responsibility for the bombings. In an e-mail to an Indian TV channel, the outfit says it organised the bombings using 16 people who are all "safe". According to the e-mail, the main motive seems to have been a retaliation to the situation in the Gujarat and Kashmir regions, possibly referring to the alleged oppression of Muslim minorities in certain parts of the region. It also says that the blasts were part of a series of attacks aimed at other sites such as the Mumbai international airport, Gateway of India, the Taj Mahal in Agra and the Red Fort in New Delhi. The authorities are investigating this claim and are trying to track the location of the e-mail sender. However, on 17 July, the forensic science laboratory Mumbai has confirmed the use of a mixture of the highly explosive RDX and Ammonium Nitrate for the bombings. The presence of these explosives in the post explosive debris was confirmed by modern techniques such as Liquid Chromatography with mass detector (LCMS), Gas Chromatography with mass detector (GCMS) and Ion Scan Chromatography. They have indicated a strong possibility of all explosives being planted at the Churchgate railway station, which was the starting point for all affected trains. Initially, religious extremists from the Lashkar-e-Taiba and the banned Students Islamic Movement of India terrorist groups, and Pakistan's intelligence agency ISI were the prime suspects. Both Lashkar and SIMI denied responsibility for the bombings. There was also evidence about the involvement of the international Islamic terrorist group Al-Qaeda following a phone call from a man claiming to be a spokesperson for the group on 13 July. The alleged al-Qaeda spokesman had said the blasts were a "consequence of Indian oppression and suppression of minorities, particularly Muslims." On 30 September 2006, CNN reported that "The Indian government accused Pakistan's military spy agency, the Inter-Services Intelligence, of planning 11 July Mumbai train bombings that killed 209 people". The New York City Police Department was intensely concerned about the attacks, citing their simplicity and lethality. To address these worries, the department deployed Brandon del Pozo, a Jordanian-based intelligence officer, to Mumbai to collect information on the attacks and report on ways they reflected similar vulnerabilities